Ariana Grande: Do ya think I’m sexy?

Ariana Grande has only been out of the gate some 21 years, but has faced some backlash since changing her image from sweet, prim schoolgirl to kinky bondage instructor.

One famous mom who definitely won’t be buying the Boca Raton native’s music is Big Bang Theory star Mayim Bialik. The 38-year-old divorced mother of two (who has been criticized herself for “attached parenting”) recently blogged about an ad featuring Grande in a risque choice of attire. “Based on the billboard, she sells lingerie. Or stiletto heels,” Bialik wrote. “Why is she in her underwear ...? And if she has a talent (is she a singer?), then why does she have to sell herself in lingerie?”

But this new, PG13 act may be something that comes naturally, not a direct order from an image consultant or lascivious agent. In other words: Ariana has no problem with the fact that sex sells.

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The Bang Bang singer tells Marie Claire’s October issue that by the time she was 14 she was ready to make an R&B album, no holds barred: “I wrote this song called Higher, and the lyrics were too sexual, too mature,” said the onetime Nick star, who left North Broward Preparatory School to pursue her career. “And my mom was like, ‘This is a great song, but damn, you’re too young for this.’”

So what’s Mama saying these days? We’ll see when Ariana heads back home during her first headlining tour this spring, supporting her sophomore album, My Everything, with a stop at AmericanAirlines Arena March 28. We hope she plays nice -- rumor has it Scooter Braun’s client has been acting a little diva-ish of late.

Tickets go on sale 10 a.m. Saturday through Ticketmaster, 800-745-3000. But if you really, really can’t wait, you can nab pre-sale tickets by downloading the newly launched Ariana fan member app, Fahlo.

NOT A CARE IN THE WORLD

Perhaps Demi Lovato shares Ariana’s stylist? The Really Don’t Care singer did her own version of vamping it up Sunday night at the AmericanAirlines Arena, one stop on her 37-date world tour. Attention Halloween costume shoppers: Forget Frozen. The vixen look is in. Lovato was dressed in head to toe leather, a spiky bustier and chunky boots. Earlier in the day, Lovato, 22, chose pastels, sunbathing in a two-piece bathing suit at her downtown Miami hotel pool, which, judging by the luxe teak chairs, appeared to be the JW Marriott Marquis, close to AAA.

NESTING TIME

Onetime Bachelorette Ashley Hebert and her pick from the show, now-husband JP Rosenbaum, won’t have to worry about bundling about their new baby this winter.

The ABC-matched couple, who were based in the New York area, decided to put down stakes in Miami while they await the birth of a boy. Hebert, a pediatric dentist, and Rosenbaum, who is in the construction business, have been seen around town getting groceries; walking her teacup Yorkie; and picking up stuff for the little one.

If you care, you can keep up to date with Hebert’s bump; she and JP are very active on social media. He captioned an Instagram pic of her huge belly with, “Ash keeps telling me that in [M]iami, belly shirts are in!”

MOVIE STAR

Udonis Haslem is going beyond the Ice Bucket Challenge. The Miami Heat forward is appearing in a short film to help bring awareness about ALS, better known as ALS.

Who is Lou Gehrig? is being written and possibly directed by Gil Green, a friend of Haslem’s who has worked on music videos for many rappers as well as videos and commercials for the Heat.

The documentary, which will premiere at the Borscht Film Festival, Dec. 18-21, follows Jeff Fogel, a childhood friend of Green’s, who despite being diagnosed with ALS three years ago, continues to coach preteen girls at Michael-Ann Russell Jewish Community Center in North Miami Beach.

Besides taking a role, Haslem is also working on securing Heat tickets, signed balls and other memorabilia for those who donate to the film via Kickstarter.

“I never had [acting] in my blood, but I can’t think of a better reason to get out of my comfort zone and shed some light about this terrible disease,” UD says in a video promoting the fundraising campaign.

How to get involved: Go to kickstarter.com and do a search for “Who is Lou Gehrig?”